Well fluid isolation and sample apparatus and method

Patent · Sun Jan 01 04:00:00 EST 1995

OSTI ID:870068

Schalla, Ronald ^[1]; Smith, Ronald M ^[2]; Hall, Stephen H ^[1]; Smart, John E ^[2]

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1. Kennewick, WA
2. Richland, WA

The present invention specifically permits purging and/or sampling of a well but only removing, at most, about 25% of the fluid volume compared to conventional methods and, at a minimum, removing none of the fluid volume from the well. The invention is an isolation assembly that is inserted into the well. The isolation assembly is designed so that only a volume of fluid between the outside diameter of the isolation assembly and the inside diameter of the well over a fluid column height from the bottom of the well to the top of the active portion (lower annulus) is removed. A seal may be positioned above the active portion thereby sealing the well and preventing any mixing or contamination of inlet fluid with fluid above the packer. Purged well fluid is stored in a riser above the packer. Ports in the wall of the isolation assembly permit purging and sampling of the lower annulus along the height of the active portion.

• Research Organization: BATTELLE MEMORIAL INSTITUTE
• DOE Contract Number: AC06-76RL01830
• Assignee: Battelle Memorial Institute (Richland, WA)
• Patent Number(s): US 5450900
• OSTI ID: 870068
• Country of Publication: United States
• Language: English

Related Subjects

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25
active
active portion
annulus
apparatus
assembly
bottom
column
compared
contamination
conventional
conventional methods
designed
diameter
fluid
fluid isolation
fluid volume
height
inlet
inlet fluid
inserted
inside
inside diameter
isolation
method
methods
minimum
mixing
outside
outside diameter
packer
permit
permits
permits purging
portion
ports
positioned
preventing
purged
purging
removed
removing
riser
sample
sample apparatus
sampling
seal
sealing
specifically
specifically permits
stored
top
volume
volume compared
wall